Couple of warning signs: (1) Article is actually a paid advertisement, and doesn't pretend to anything like peer review. (2) "In addition to the statistical e

Couple of warning signs: (1) Article is actually a paid advertisement, and doesn't pretend to anything like peer review. (2) "In addition to the statistical evidence, Renshaw collected anecdotes that supported his developing theory." Seriously? As we don't have anything like a useful theory of what depression is and the details of how neurotransmitter levels are connected to mood, especially over the long term, he's really jumping to conclusions. His statistical correlation is weak, and correlates to a lot of other things (maybe Republicans cause suicide, or proximity to harbors protects you from suicide). He needs a causal mechanism and a LOT better data before this is anything like a useful hypothesis. By the way - lets note that Switzerland's suicide rate is considerably lower that France, and half that of Japan (most of whose population centers are near sea level).